Marinara sauce: I placed olive oil (1/4 cup), 3-4 cloves of garlic (minced), and red pepper flakes (optional), in a small deep pot on a low flame. When the garlic became fragrant, I added canned whole tomato, drained and crushed (16 oz can), dried oregano and basil (1/2 tsp, each), salt and freshly ground black pepper. I simmered this sauce for 30 minutes. I tasted and adjusted the salt and pepper. You may want to add a pinch of sugar to cut the acidity.
Yuzu-miso sauce: Mix red miso (3 tbs), sugar (2tbs), and mirin (3 tbs) in a small sauce pan on a low flame. Keep stirring until nice thin saucy consistency is attained (about 5 minutes). I added 1 tsp of dark roasted sesame oil (optional) at the end and mix well. Off heat, I add Yuzu juice (from a bottle) (1 tsp) and zest of one lime (using a micrograter) or just lime or lemon juice and zest.
In the above picture, on the left is the eggplant with Marinara sauce and on the right is the one with Yuzu-miso sauce. I garnished the Yuzu-miso eggplant with the zest of a lime and, if I had fresh basil, I would have garnished the marinara sauce side with chopped basil. You can have this with wine, beer or sake. We had this with Poggio Il Castellare Sant Antimo Cervio Cabernet Sauvignon 2007, which taste more like California cab rather than Super Tuscan, but it went very well with this dish nonetheless.